Bluetooth axborot almashish interfeysi
![ESP32 Bluetooth moduli bilan Arduino misoli. Vazifa: ESP32 BLE rejimida
harorat sensori ma’lumotlarini mobil ilovaga uzatadi.
Kerakli komponentlar: ESP32 mikrokontrolleri, DHT11 harorat sensori,
Mobil telefon (nRF Connect yoki LightBlue ilovasi),
Ulanish sxemasi: DHT11 VCC → ESP32 3.3V, DHT11 GND → ESP32
GND, DHT11 DATA → ESP32 pin 15
Kod:
#include <Wire.h>
#include "BLEDevice.h"
#include "DHT.h"
#define DHTPIN 15 // DHT sensori uchun data pin
#define DHTTYPE DHT11 // DHT modeli
DHT dht ( DHTPIN , DHTTYPE );
BLECharacteristic * pCharacteristic;
bool deviceConnected = false ;
void setup () {
Serial . begin ( 115200 );
dht . begin ();
BLEDevice :: init ( "ESP32-DHT11" ); // Qurilma nomi
BLEServer * pServer = BLEDevice :: createServer ();
pServer -> setCallbacks ( new MyServerCallbacks ());
BLEService * pService = pServer -> createService ( BLEUUID ( "180A" ));
pCharacteristic = pService -> createCharacteristic (
BLEUUID ( "2A6E" ),
BLECharacteristic ::PROPERTY_READ |
BLECharacteristic ::PROPERTY_NOTIFY
);
pService -> start ();
BLEAdvertising * pAdvertising = BLEDevice :: getAdvertising ();
pAdvertising -> start ();
}
void loop () {
if (deviceConnected) {
float temp = dht . readTemperature (); // Haroratni o‘qish
char tempStr [ 8 ];
dtostrf (temp, 1 , 2 , tempStr);
pCharacteristic -> setValue (tempStr);
pCharacteristic -> notify (); // Ma’lumot yuborish
19](https://docx.uz/documents/8b177019-8b3f-4336-bd36-eaa3985c62a1/page_18.png?v=1)
![void loop () {
float temp = dht . readTemperature (); // Haroratni o'qish
if ( ! isnan (temp)) {
char tempString [ 8 ];
dtostrf (temp, 1 , 2 , tempString); // Floatni stringga aylantirish
pCharacteristic -> setValue (tempString); // BLE orqali ma'lumotni
o'rnatish
pCharacteristic -> notify (); // Ma'lumotni jo'natish
Serial . println (tempString); // Konsolga chop etish
}
delay ( 2000 ); // 2 soniya kutish
}
24](https://docx.uz/documents/8b177019-8b3f-4336-bd36-eaa3985c62a1/page_23.png?v=1)
Bluetooth axborot almashish interfeysi